21100225686623 has 2 divisors, whose sum is σ = 21100225686624. Its totient is φ = 21100225686622.

The previous prime is 21100225686587. The next prime is 21100225686647. The reversal of 21100225686623 is 32668652200112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100225686623 - 2¹⁰ = 21100225685599 is a prime.

It is a super-2 number, since 2×21100225686623² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100225688623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550112843311 + 10550112843312.

It is an arithmetic number, because the mean of its divisors is an integer number (10550112843312).

Almost surely, 2^{21100225686623} is an apocalyptic number.

21100225686623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100225686623 is an equidigital number, since it uses as much as digits as its factorization.

21100225686623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 44.

Adding to 21100225686623 its reverse (32668652200112), we get a palindrome (53768877886735).

The spelling of 21100225686623 in words is "twenty-one trillion, one hundred billion, two hundred twenty-five million, six hundred eighty-six thousand, six hundred twenty-three".